Vat dye.



UNITED STATES PATENT OFFICE.

WILI-IELM BAUER, 0F VOI-IWINKEL, AND ALFRED HERRE AND RUDOLF MAYER, OFELBERFELD, GERMANY, ASSIGNORS T0 FARBENFABRIKEN VORM. FRIEDR. BAYER 8600., OF ELBERFELD, GERMANY, A CORPORATION OF GERMANY.

VAT DYE.

No Drawing.

Specification of Letters Patent.

Patented Oct. 10, 1911.

To all whom it may concern:

Be it known that we, VVILHELM BAUER, residing at Vohwinkel, and ALFREDHERRE and RUDoLE MAYER, residing at Elberfeld, Germany, citizens of theGerman Empire, have invented new and useful Improvements in New Vat Dye,of which the following is a specification.

Our invention relates to the manufacture and production of new andvaluable vat dyestuffs. They are obtained by condensingbeta-naphthisatin derivatives in which the oxygen of the alpha-ketogroup is replaced by easily movable or replaceable substituents, e. g.halogen, sulfur, the amino group, the alkoXy group with analpha-oxyanthracene, especially l-anthrol, 1.5-dioxyanthracene,1.8-dioxyanthracene and their derivatives having a free ortho positionto the hydroXy group.

The new dyes containing probably in their molecule the group:

R meaning the naphthalin nucleus of the beta-naphthisatin compound, arein a dry state dark violet crystalline powders which are soluble in hotnitrobenzene generally with the blue coloration; and which yield withhydrosulfite and caustic soda lye generally yellow vats dyeing cottonafter exposure to air reddish-gray to black shades remarkable for theirfastness to chlorin.

In order to illustrate the new process more fully we can proceed asfollows, the parts being by weight 197 parts of betanaphthisatin areconverted into the alphachlorid by heating them with 220 parts of P01and 3500 parts of dry chlorobenzene. The mixture thus obtained is thenadded to a warm solution, which is well stirred, of 210 parts ofl-anthrol in 2000 parts of dry chlorobenzene; stirring is continued forabout 12 hours. The dye is filtered off and washed with benzene andether. It is a dark violet crystalline powder soluble in concentratedsulfuric acid with a dark blue color,

scarcely soluble in benzene, soluble in hot nitrobenzene with a bluecolor. It forms a vat with hydrosulfite and caustic alkali, from whichvat cotton is dyed after exposure to air fast violet-gray toreddishblack shades.

We claim 1. The herein described new dyestuffs containing probably intheir molecule the group:

R meaning the naphthalin nucleus of the beta-naphthisatin compound,which dyestuffs are in a dry state dark violet crystalline powders whichare soluble in hot nitrobenzene generally with a blue coloration, andwhich yield with hydrosulfite and caustic soda lye vats dyeing cottonafter exposure to air from reddish-gray to black shades remarkable fortheir fastness to chlorin, substantially as described.

2. The herein described new dyestuffs WILHELM BAUER. 11s. ALFRED HERRE.[Ls] EUDoLE MAYER. [L 8.]

.Witnesses:

CHAS. J. WRIGHT, WALTER VONNEGUT.

' Copies of this patent may be obtained for five cents each, byaddressing the Commissioner of Patents, Washington, D. G.

Correction in Letters Patent No. M00534}.

It is hereby certified that in Letters Patent No. 1,005,111, grantedOctober 10, 1911, upon the application of Wilhelm Bauer, of Vohwinkel,and Alfred Herre and Rudolf Mayer, of Elberfeld, Germany, for animprovement in Vat Dyes," an error appears in the printed specificationrequiring correction as follows: Line 79, for the Word dyestuffs readdyestuf; and that the said Letters Patent should be read With thiscorrection therein that the same may conform to the record of the casein the Patent Office.

Signed and sealed this 30th day of January, A. D., 1912.

G. C. BILLINGS,

Acting Commissioner of Patents.

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